Huge enhancement in electrochemical performance of nano carbide-derived carbon obtained by simply room-temperature soaking treatment in HF and HNO3 mixed solution
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Herein we propose a facile and effective method to improve the supercapacitive performance of nano titanium carbide derived carbon (TiC-CDC), which is realized by simply soaking the TiC-CDC sample in the mixed acid solution made by a combination of HF and HNO3 for a designated duration at room temperature. After the acid-soaking, there occurs no significant change in the CDC microstructure, and the specific surface area shows only a little rise (from 958 to 1011 m2 g− 1). However, the specific capacitance of the acid-soaked TiC-CDC increases dramatically from 83 to 304 F g− 1 at the scan rate of 1 A g− 1 in 6 M KOH aqueous electrolyte, showing a more than 3 times improvement in comparison to that of the pristine CDC sample, which is, to the best of our knowledge, among the highest values so far reported for the CDC carbon materials. In addition, the acid-soaked TiC-CDC also exhibits a good rate capability (188 F g− 1 @ 500 mV s− 1) and an excellent cycling stability (no evident performance degradation after 8000 consecutive cycles). The present work may suggest that the mixed acid-soaking treatment at room temperature will be promising for the enhancement of the electrochemical performance for porous carbons.
KeywordsNano titanium carbide derived carbon Supercapacitive performance Mixed acid-soaking
Project 51872253 supported by National Natural Science Foundation of China.